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3.10.1

PLL Controls

The settings for enabling and disabling operation (oscillation) and for the multiply-by
rate can be controlled for the PLL oscillator circuits that correspond to the main clock.
Each control is set in the clock source control register (CLKR).
This section describes each control.
■ PLL Operation Enable
To enable or disable the main PLL oscillator circuit operation, set bit 10 (PLL1EN bit) of the clock source
control register (CLKR).
To enable or disable the subclock oscillator circuit operation, set bit 11 (PLL2EN bit) of the clock source
control register (CLKR).
After a setting initialization reset (INIT), bits PLL1EN and PLL2EN are initialized to "0", causing the PLL
oscillator circuit operation to stop. While it is stopped, PLL output cannot be selected as the source clock.
When the program operation starts, set the multiply-by rate of the PLL to be used as the clock source,
enable it, and switch the source clock after the PLL lock wait time elapses. For the PLL lock wait time, use
of a timebase timer interrupt is recommended.
While PLL output is selected as the source clock, the PLL cannot be stopped (writing to the register is
disabled). To stop a PLL upon transition to stop mode, reselect as the source clock the main clock divided
by two before stopping the PLL.
If Bit 0 (OSCD1 bit) or Bit 1 (OSCD2 bit) of the standby control register (STCR) is set to stop oscillation
in stop mode, the corresponding PLL automatically stops when the device enters stop mode. As a result,
you do not need to set operation stop. When the device returns from stop mode later, the PLL automatically
restarts the oscillation operation. If oscillation is not set to stop in stop mode, the PLL does not
automatically stop. In this case, set operation stop before transition to stop mode as required.
■ PLL Multiply-by Rate
Set the multiply-by rate of the main PLL in Bits 14 to 12 (PLL1S2, PLL1S1, and PLL1S0 bits) of the clock
source control register (CLKR).
After a setting initialization reset (INIT), all bits are initialized to "0".
PLL multiply-by rate setting
To change the PLL multiply-by rate setting from the initial value, do so before or as soon as the PLL is
enabled after the program has started execution. After changing the multiply-by rate, switch the source
clock after the lock wait time elapses. For the PLL lock wait time, use of a timebase timer interrupt is
recommended.
To change the PLL multiply-by rate setting during operation, switch the source clock to a clock other than
the PLL in question before making the change. After changing the multiply-by rate, switch the source clock
after the lock wait time has elapsed, as described above.
You can also change the PLL multiply-by rate setting while using a PLL. In this case, however, the
program stops running after the device automatically enters the oscillation stabilization wait state after the
multiply-by rate setting is rewritten and does not resume execution until the specified oscillation
stabilization wait time has elapsed. The program does not stop running if the clock source is switched to a
clock other than a PLL.
105

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